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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ae2596a16f4a2224c04506b9571400227b3f7595b2d5b5ab7e8aec3cf191b22e' 
  AND token = 'qQcJue0U/+A2PgpbUgPkGztsk2IVjSIcaUrI0B/TRRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}